What is exactly stamina? What happens when it gets trained? Do your lungs get better and more efficient at pumping air?

Question

What is exactly stamina? What happens when it gets trained? Do your lungs get better and more efficient at pumping air?

In: Biology

Answer 1

You body becomes more efficient at using things like oxygen and energy and also you become more accustomed to doing without. For example, the average person can survive with no brain damage without oxygen for about 5 minutes. Elite level swimmers can go upwards of 20 minutes without oxygen before they start to suffer brain damage.
Your body becomes more efficient and better able to cope without.